Ukraine's Zelenskyy says constitution prevents territorial surrender to Russia as international leaders discuss potential peace negotiations with Moscow.

US President Donald Trump is threatening tariffs on other countries that buy Russian oil, in an attempt to pressure Moscow to end the war in Ukraine. But the United States and Europe themselves are still doing billions of dollars in trade with Russia.

Treasury Secretary Scott Bessent urged European nations to be prepared to get on board with higher tariffs on China and other nations that buy Russian energy, lamenting that he got a cool response when he floated the idea at a Group of Seven meeting earlier this year.

Ukraine's Volodymyr Zelenskiy and European leaders will meet Donald Trump in Washington on Monday to map out a peace deal amid fears the U.S. president could try to pressure Kyiv into accepting a settlement favourable to Moscow.

Concerns have mounted in Europe and Ukraine that Kyiv may be pressed to give up land or accept other curbs on its sovereignty.

Hungarian opposition leader Peter Magyar urged Russia on Aug. 17 to guarantee it would not interfere in Hungary's politics, following claims from Moscow that the EU seeks to unseat Prime Minister Viktor Orban.

Hungary accused Ukraine of an "outrageous and unacceptable" attack that disabled a Russian oil pipeline supplying the NATO ally—and fired a warning to Kyiv about its reliance on Hungarian electricity supplies. Newsweek has contacted the Ukrainian foreign ministry for comment.

Russia’s illegal seizure of the Crimean Peninsula from Ukraine in March 2014 was quick and bloodless, and it sent Moscow’s relations with the West into a downward spiral unseen since the Cold War.